Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from hogtown.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl) (->ota+space.digests) ID ; Wed, 6 Feb 91 02:29:16 -0500 (EST) Message-ID: Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Wed, 6 Feb 91 02:29:13 -0500 (EST) Subject: SPACE Digest V13 #121 SPACE Digest Volume 13 : Issue 121 Today's Topics: More GPS News from 14 January 1991 Issue of AW&ST Re: Solar Impact Mission. Re: liquid SCUBA -- possible? Solar Impact Mission. How Salut came down (thanks to Usenet!) I-CON X (Robin Curtis will appear!) Administrivia: Submissions to the SPACE Digest/sci.space should be mailed to space+@andrew.cmu.edu. Other mail, esp. [un]subscription requests, should be sent to space-request+@andrew.cmu.edu, or, if urgent, to tm2b+@andrew.cmu.edu ---------------------------------------------------------------------- Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: Sat, 02 Feb 91 13:52:03 AST From: Richard Langley Subject: More GPS News from 14 January 1991 Issue of AW&ST First Test of Delta II - 7925 ----------------------------- The launch of first Navstar GPS Block IIA satellite on 26 November 1990, was also the first test of an improved version of the Delta II launch vehicle. The 7925 Delta can put a 4,000 lb. payload into a 19,242 x 400 nautical mile orbit, an increase in capacity of about 800 lb. The improved performance is due to new graphite epoxy strap-on motors and an enlarged main engine nozzle. Total liftoff thrust of the Rocketdyne RS-27A main engine and the nine Hercules Aerospace solid-propellant strap-on motors is 794,220 lb. Inmarsat / GPS / GLONASS Developments ------------------------------------- o Northwest Airlines has taken delivery of two Soviet-built GLONASS receivers. One of these will be installed on a Boeing 747 cargo aircraft already outfitted with a Honeywell hybrid GPS / inertial navigation system. o A subcommittee of ARINC's Airlines Electronics Engineering Committee is working with Soviet GLONASS and avionics specialists to develop specifications for a combined GPS-GLONASS receiver. o At the ARINC subcommittee's latest meeting in Leningrad, the Soviets indicated that they are considering a plan to cut the number of GLONASS frequency channels in half. This would be done by assigning the same channel to satellites on opposite sides of the earth. o Soviet officials have admitted that delays in GLONASS launches are due to microcircuit reliability problems. o Three GLONASS satellites were launched on 8 December 1990. o Soviet officials indicated the target date for the full 24-satellite GLONASS constellation deployment is 1995. After the year 2000, the officials said, the USSR plans to start shutting down ground-based aids. o The Soviets have offerred to broadcast the difference between the GLONASS clock reference time and GPS time in the GLONASS message. o The third generation Inmarsat satellites will radiate a GPS-like signal and will transmit GPS and GLONASS reliability information as well as the GPS - GLONASS clock difference information. Miniature GPS-based Guidance System to be Developed --------------------------------------------------- The U.S. Defense Advanced Research Projects Agency has awarded a 3.5 year, $13-million contract to Litton Guidance and Control Systems to integrate an inertial naviagtion sensor consisting of silicon chip accelerometers and a small, high-accuracy interferometric fiber-optic gyro with a gallium arsenide GPS receiver to produce a miniature guidance package. (Source: Aviation Week & Space Technology, 14 January 1991) ============================================================================== Richard B. Langley BITnet: LANG@UNB.CA or SE@UNB.CA Geodetic Research Laboratory Phone: (506) 453-5142 Dept. of Surveying Engineering Telex: 014-46202 University of New Brunswick FAX: (506) 453-4943 Fredericton, N.B., Canada E3B 5A3 ============================================================================== ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 4 Feb 91 16:14:37 GMT From: magnus.ircc.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!cs.utexas.edu!news-server.csri.toronto.edu!helios.physics.utoronto.ca!physics.utoronto.ca!neufeld@tut.cis.ohio-state.edu (Christopher Neufeld) Organization: University of Toronto Physics/Astronomy/CITA Subject: Re: Solar Impact Mission. References: Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu In article printf@cix.compulink.co.uk (Ian Stirling) writes: >Why isnt it possible to cancel the orbital velocity via a close flyby >of mercury.Instead of using Antimatter(eg) > Two reasons I can think of off-hand. First, you've already done a lot of the work if you've dropped your orbit to that of Mercury. It costs less in delta-v to go to Jupiter than it does to go to Mercury. Second, Mercury is small, and so has a low mass to radius ratio, which puts an upper limit on the deflection angle, and hence the heliocentric velocity change, acheivable by a Mercury flyby. In other words, you wouldn't gain much doing a Mercury flyby because the closest you can get to it is the surface of the planet, and that still isn't close enough to make a big difference. >Would the approach velocity to the sun be too high? > I don't see what heliocentric velocity has to do with it, after all, the probe is stationary in its own reference frame, and friction is negligible. -- Christopher Neufeld....Just a graduate student | "Shtarker! Zis is KAOS! neufeld@helios.physics.utoronto.ca Ad astra! | Vee do not 'yippee yo cneufeld@{pnet91,pro-cco}.cts.com | kye aye' here!" "Don't edit reality for the sake of simplicity" | Siegfried of KAOS ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 31 Jan 91 18:21:45 GMT From: att!pacbell.com!pacbell!barn!everexn!mike@ucbvax.Berkeley.EDU (Mike Higgins) Organization: Everex Systems, Inc. Subject: Re: liquid SCUBA -- possible? References: <1991Jan24.030338.4153@athena.cs.uga.edu>, <1991Jan29.010316.26621@gjetor.geac.COM> Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu In <1991Jan29.010316.26621@gjetor.geac.COM> adeboer@gjetor.geac.COM (Anthony DeBoer) writes: >>In article <1991Jan24.030338.4153@athena.cs.uga.edu> boone@athena.cs.uga.edu (Roggie Boone) writes: >> [discussion of liquid-breathing apparatus such as in the movie _The Abyss_] >>My question is, does such equipment really exist? If so, who uses it and >>for what purposes? This technology was talked about back in the 1970's, maybe earlier. I remember seeing pictures of mice in liquid-breathing liquid when I was in grammer school, much like the scene in The Abyss. As I recal, most of the mice subjected to this DIED of pnumonia or other lung complications afterwards. It seems the lungs have a great deal of trouble fighting off normal infections during and AFTER this kind of treatment. I cringed when I saw them do this to a rat in the movie: I assume the rat died and wondered if they got in trouble for cruelty to animals... Well, maybe the technology has improved in the last 20 years. Mike Higgins mike@everexn.com ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 3 Feb 91 21:32:00 GMT From: cix.compulink.co.uk!printf@ucbvax.Berkeley.EDU (Ian Stirling) Subject: Solar Impact Mission. Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu Why isnt it possible to cancel the orbital velocity via a close flyby of mercury.Instead of using Antimatter(eg) _ / \ | | X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 4 Feb 91 08:57:18 GMT From: mcsun!unido!mpirbn!p515dfi@uunet.uu.net (Daniel Fischer) Organization: Max-Planck-Institut fuer Radioastronomie, Bonn Subject: How Salut came down (thanks to Usenet!) Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu Once more the efficiency of Usenet has stunned my: my posting last week requesting data on Salut 7's orbital decay has been answered twice, Y.Yanada faxed me a plot and M.McCants supplied 443 sets of orbital data covering the past seven years. Plotting the orbital height of the space station vs. time looks remarkable, a rough sketch follows: ****************** ---------- 470 km * ********* * ***** * ** * ** ------ 370 km *** * <- Lifting in 1986 * * **** * * * ***** * * * ** Early 1991 -> * --- 270 km It's interesting to note how much slower Salut descended at 330 km altitude in 1985 than it did in 1990, obviously the atmospheric drag is much higher now (or is it due to a greater surface of attack due to Salut tumbling now - anyone knowing its attitude recently?) - which again should be due to us being close to the solar maximum now and to minimum then. Am I handwaving correctly? ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 3 Feb 91 15:36:54 GMT From: att!cbnewsj!cbnewsi!bicker@ucbvax.Berkeley.EDU (The Resource, Poet-Magician of Quality) Organization: Quality Process Center Subject: I-CON X (Robin Curtis will appear!) References: <1991Jan31.220059.23958@cbnewsi.att.com> Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu This just in... Robin Curtis, Saavik in the Star Trek Film Series will be appearing at I-CON X! I - C O N X The East Coast's Largest Convention of Science Fact, Fiction, and Fantasy April 19-21, 1991 State University, Stony Brook, Long Island, NY Special Guest: Majel Barret Number One, Nurse Chapel, Lwaxana Troi, and the voice of the computer on Star Trek Special Guest: Robin Curtis Saavik on Star Trek Special Guest: Tom Baker* Doctor Who Guest-of-Honor: Dan Simmons Author of the Hugo Award winning novel Hyperion Special Guest: Harlan Ellison Other SF, Fantasy & Horror Guests: Poul Anderson, Jim Frenkel, Joan D. Vinge, Larry Niven, Fred Pohl, Jack Williamnson. Roger MacBride Allen, Jim Baen, Ian and Betty Ballantine, Hal Clement, Tom Doherty, Robert L. Forward, Raymond Z. Gallun, Barry Malzberg, James Morrow, Thomas Monteleone, Pamela Sargent, John Skipp, Craig Spector, Bruce Sterling, Keil Stuart, Tom Weisskopf, George Zebrowski, David Kyle, Tracy Hickman, Patricia Kennealy, Nancy Springer, Margaret Weiss, and more... Science Guest-of-Honor: Robert L. Forward Science and Technology Special Guests: Deke Slayton Mercury and Apollo Astronaut (currently negotiating with a Russian cosmonaut as well) Gaming Guest-of-Honor: Ken Rolston Co-creator of Paranoia Gaming Special Guest: Gary Gygax (Creator of Dungeons & Dragons) Gaming Special Guest: Steve Jackson (Developer of GURPS) Other Gaming Guests: Greg Costikyan, Jahn Faughnan, Stefan Jones, and more... Artist Guests: Jill Bauman, Doug Beekman, Tom Kidd, Ron Walotsky, and Gahan Wilson. Comics Guests: Micheal Jan Friedman, Bob Greenberger, Fred Hembeck, Steve Saffel, and Julie Schwarz. Films: (To be announced) In addition to the personal appearances, panels and film program, I-CON features an Art Show, Meet the Pros Parties, dealers' rooms, writers' workshops, autograph party, no- minimum-bid auctions, gaming, filksinging, japanimation, model rocketry, gaming tournaments, sneak previews of upcoming films, videos, stargazing, ... Special Event: I-CON Awards Banquet: Our annual presentation of the Gallun Award. Dinner. Saturday, 5:30pm, $20 additional. Ticket Information: $20 until March 31, 1991 (Children 5-11 years old, $8). $25 at the door (Children 5-11 years old, $10). Children under 12 must be accompanied by a ticketholding adult at all times. I-CON P.O. Box 550 Stony Brook, NY 11790 Please mark on the back of your envelope "USENET Registrant" so that we can get in touch with you if there is to be a USENET party. To be sure of being informed of any USENET activities...send email to me at bicker@hoqax.ATT.COM Hotel List: The CON Hotel is the Holiday Inn in Stony Brook. Accomodations there are available only through the convention: send $69/night/room to the above address, indicating which night(s) you would like accomodations for. Other local area motels are listed below: +o Beacon Motel (516) 265-0602 +o Smithtown Motor Lodge (516) 724-9000 +o Terryville Motor Lodge (516) 928-5900 +o Harborside Inn of Port Jefferson (516) 473-2499 No weapons. For more information, send email to bicker@hoqax.ATT.COM. Please do not call...but if you call, at least leave a phone number so I can get back to you. From: bicker@cbnewsi (The Resource, Poet-Magician of Quality) Newsgroups: rec.arts.sf-lovers,rec.arts.startrek,rec.games.frp,sci.space,rec.arts.anime,rec.arts.drwho,rec.arts.comics,alt.fandom.cons,ny.general,nj.events Subject: cmsg cancel <1991Jan31.220059.23958@cbnewsi.att.com> References: <1991Jan31.220059.23958@cbnewsi.att.com> Distribution: usa Organization: AT&T Bell Laboratories Quality Process Center This message was cancelled from within rn. -- Brian Charles Kohn AT&T Bell Laboratories Quality Process Center Quality Management System E-MAIL: att!hoqax!bicker (bicker@hoqax.ATT.COM) Consultant PHONE: (908) 949-5850 FAX: (908) 949-7724 ------------------------------ End of SPACE Digest V13 #121 *******************